The `ENUM` class in `sqlalchemy.dialects.postgresql` module of Python's SQLALchemy library represents an enumeration type in PostgreSQL databases. It allows for creating a fixed set of values that can be assigned to a column in a table, similar to an enumerated type in other programming languages. The `ENUM` class provides methods and attributes to define and manipulate enumerated types, including creating and dropping them, adding and removing values from existing types, and storing values of enumerated types in database columns.
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